# Evaluation of Full Versus Fractional Dose of COVID-19 Vaccine Given as a Booster for the Prevention of COVID-19 in Adults in Mongolia.

> **NCT05265065** · PHASE3 · COMPLETED · sponsor: **Murdoch Childrens Research Institute** · enrollment: 601 (actual)

## Conditions studied

- COVID-19

## Interventions

- **BIOLOGICAL:** Tozinameran - Standard Dose
- **BIOLOGICAL:** Tozinameran - Fractional Dose

## Key facts

- **NCT ID:** NCT05265065
- **Lead sponsor:** Murdoch Childrens Research Institute
- **Sponsor class:** OTHER
- **Phase:** PHASE3
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2022-05-27
- **Primary completion:** 2022-09-30
- **Final completion:** 2024-11-06
- **Target enrollment:** 601 (ACTUAL)
- **Last updated:** 2026-03-24

## Collaborators

- [object Object]
- [object Object]

## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT05265065

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT05265065, "Evaluation of Full Versus Fractional Dose of COVID-19 Vaccine Given as a Booster for the Prevention of COVID-19 in Adults in Mongolia.". Retrieved via AI Analytics 2026-07-09 from https://api.ai-analytics.org/clinical/NCT05265065. Licensed CC0.

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